Moiré Exchange Effect in Twisted WSe2/WS2 Heterobilayer

Zhu, Jiayi; Zheng, Huiyuan; Wang, Xi; Park, Heonjoon; Xiao, Chengxin; Zhang, Yinong; Taniguchi, Takashi; Watanabe, Kenji; Yan, Jiaqiang; Gamelin, Daniel R.; Yao, Wang; Xu, Xiaodong

doi:10.1103/physrevlett.133.086501

Moiré Exchange Effect in Twisted WSe₂/WS₂ Heterobilayer

Journal Article · Wed Aug 21 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.133.086501· OSTI ID:2438737

Zhu, Jiayi ^[1]; Zheng, Huiyuan ^[2]; Wang, Xi ^[3]; ^[1]; ^[2]; ^[1]; ^[4]; ^[4]; ^[5]; ^[1]; Yao, Wang ^[6]; ^[1]

Univ. of Washington, Seattle, WA (United States)
Univ. of Hong Kong (Hong Kong)
Univ. of Washington, Seattle, WA (United States); Washington Univ., St. Louis, MO (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Hong Kong (Hong Kong); HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong (Hong Kong)

Moiré superlattices of layered transition metal dichalcogenides are proven to host periodic electron crystals due to strong correlation effects. These electron crystals can also be intertwined with intricate magnetic phenomena. Here, in this Letter, we present our findings on the moiré exchange effect, resulting from the modulation of local magnetic moments by electron crystals within well-aligned WSe₂/WS₂ heterobilayers. Employing polarization-resolved magneto-optical spectroscopy, we unveil a high-energy excitonic resonance near one hole per moiré unit cell (v=–1), which possesses a giant g factor several times greater than the already very large g factor of the WSe₂ A exciton in this heterostructure. Supported by continuum model calculations, these high-energy states are found to be dark excitons brightened through Umklapp scattering from the moiré mini-Brillouin zone. When the carriers form a Mott insulating state near v=–1, the Coulomb exchange between doped carriers and excitons forms an effective magnetic field with moiré periodicity. This moiré exchange effect gives rise to the observed giant g factor for the excitonic Umklapp state.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725; SC0018171

OSTI ID:: 2438737

Alternate ID(s):: OSTI ID: 2474484

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 133; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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